The actress's intense performance is said to have left her exhausted and with a sore throat.

A source told NDTV: "The kind of scenes that she was doing a few days ago were really intense and required Bebo to bring out the rawness of feelings that her character undergoes at some point in the storyline."

The source further revealed that the Agent Vinod star chose a 'natural' approach for her performance, explaining: "Kareena was sure that behaving like her character would bring out a better result. In the scenes where she has to shout at her co-actors Arjun Rampal and Randeep Hooda, she let the feelings simmer within her before going in for the take.

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"So when she shot those scenes, she was really screaming her lungs out, expressing the rage and the pain that her character feels at that moment.

"She stuck to her natural approach. So when Madhur Bhandarkar called for action, she actually burst out sobbing and was giving her dialogue in between sniffles, while everyone around watched in rapt attention.

"It took Madhur Bhandarkar a couple of seconds to realise that the shot was over, before he could call 'Cut!'"

By the end of the day's shoot, Kapoor was said to be exhausted and had a sore throat.

"So much so that she couldn't speak properly. Naturally, the director was doubly worried. The heavy-duty action scenes were taking a toll on his leading lady and they couldn't afford to cancel even a day's shoot.

"Thankfully, Kareena was feeling better the following day," said the source.

The actress was unavailable for comment, but her spokesperson said, "Kareena was unwell for a couple of days but didn't let it affect the shoot schedule."